Klippel R&D System
KCS Monitor Reference
29
Remedy: Decrease audio level, decrease the
Excursion Limit
or activate the limiter in the
Properties
.
Note:
If this warning is displayed, audible artifacts due to clipping can occur.
Even if this warning is not displayed, clipping can occur because the exact maximum ratings of the
connected hardware are not always known (e.g. maximum rail voltage depends on connected PSU).
External input signal is limiting. Reduce audio input level to avoid clipping.
Cause: The input of the KCS on-line processing (before or after the KCS audio gain stage which value
is defined in KCS Monitor’s Properties) exceeds approx. -0.5dBFs.
Remedy: Check the
IN
level in the window
State.
If it is close to 0dB, reduce the input level. You
might increase the KCS audio gain in the KCS Monitor property page (
Audio Gain
slider). Make also
sure that
IN
level plus audio gain level is not exceeding 0dB.
Note:
If this warning is displayed, audible artifacts due to clipping can occur.
Temperature too high
Cause: The measured increase of the voice coil temperature exceeds the limit defined in the KCS
Monitor’s
Properties
.
Remedy:
Make sure that a speaker is connected and the correct initial data for the particular DUT is
loaded.
Insufficient Bl(x) decay. No x-offset updating possible!
Cause: For identifying the voice coil rest position, KCS evaluates the nonlinear distortion found in the
measured current signal caused by the nonlinear Bl(x) speaker characteristic. If the Bl(x) decay is too
small, voice coil position identification will not work:
Remedy: Use a driver with more nonlinear Bl(x) curve or, if possible, relax the limits in the KCS-ID
(e.g. increase the target excursion).
Note:
KCS will work anyway, but higher safety margins for the maximum allowed excursion are
required because the exact voice coil position is not known. Active voice coil stabilization will not
work if this warning is displayed.
2.6.3
Other Issues
Bad Audio Quality – Impulsive distortion
See section How to treat Rub&Buzz Issues in
[KCS2] KCS Evaluation Tutorials
.
Lack of Bass
1.
) with an appropriate frequency
fc
.
2.
Mechanical Protection System is active (see
). In this case reduce the audio gain.
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